When you try to create a Windows Vista-based Windows Imaging Format (WIM) build in Microsoft Solution Accelerator for Business Desktop Deployment (BDD), you may receive the following error message:

Error during wizard processing
An unexpected error occurred while processing the wizard results.
Collection was modified; enumeration operation may not execute.

You cannot create the WIM build.

This problem occurs if you have added components such as a hotfix or an update to the WIM image file.